concrete block wall

huangyhg

concrete block wall
alaska,
i think you will need to hire a local structural engineer to look at this.  you don't talk about temperature joints, which you will need at 20', or talk about seismic loads - even though you are in alaska, a very high seismic zone.  if you are too remote, then talk to someone in anchorage, but you will need a real engineer to do this.